The Lead Masks Case was the name given to the events which led to the death of two electronic technicians in Rio de Janeiro, Brazil. Their bodies were discovered on August 20, 1966.
A young man was flying a kite on the Morro do Vintém (Vintém Hill) when he came upon the two bodies. When police arrived, they noted the bodies’ odd conditions: The two males were lying next to each other, slightly covered by grass. Each wore a formal suit, a radiation-proof lead eye mask, and a waterproof coat. There were no signs of trauma and no evidence of a struggle. A small notebook contained the quote, “[translated] 16:30 (04:30 PM) be at the agreed place. 18:30 (06:30 PM) swallow capsules, after effect, protect metals, wait for mask signal”.
It has been noted that the area was the setting of several local UFO sightings. No injuries were discovered at the autopsy. The case was mentioned prominently in Jacques Vallée’s book Confrontations.